One of our Belgian ISP providers, Telenet, allows us to send mails using an unauthenticated SMTP server (when connected to the Telenet network). The steps below explain how you can use an unauthenticated SMTP server to send DPM notifications. In the DPM
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Read the complete post at http://scug.be/blogs/valerie/archive/2011/10/04/dpm-2010-use-unauthenticated-smtp-server.aspx